config: introduce a new value for ui.relative-paths getting old behavior The few places I've modified so far to respect ui.relative-paths have traditionally defaulted showing the path from the repo root. However, some commands (at least `hg files`) default to showing paths relative to the cwd. Let's allow a special value for ui.relative-paths to preserve the old behavior, so we can use that as default value for it. I don't expect that anyone would want to set this value, so perhaps we could have relied on it being unset, but I don't really like behaviors that can only be achieved by a unset config option. Differential Revision: https://phab.mercurial-scm.org/D5800

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  $ cat >> $HGRCPATH << EOF

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  > [extensions]

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  > absorb=

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  > drawdag=$TESTDIR/drawdag.py

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  > EOF

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  $ hg init

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  $ hg debugdrawdag <<'EOS'

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  > C

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  > |

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  > B

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  > |

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  > A

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  > EOS

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  $ hg phase -r A --public -q

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  $ hg phase -r C --secret --force -q

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  $ hg update C -q

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  $ printf B1 > B

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  $ hg absorb -aq

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  $ hg log -G -T '{desc} {phase}'

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  @  C secret

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  |

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  o  B draft

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  |

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  o  A public

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